From the education communities we have two mashups for joining Facebook and Second Life. Alja reviews them both in detail on her blog.
Although I'm not a power user of Facebook by any stretch of the imagination, I do use it, so I will be exploring them in a bit more depth over the coming weeks. Both seem pretty simple and straight-forward to set up as well.
Pick up Second Friends on EduIsland or Second Life Link on English Village.
